Income Taxes Income Taxes - Summary of Net Operating Loss and Tax Credits Carryforwards (Details) - USD ($) $ in Millions		Feb. 28, 2025	Feb. 29, 2024
Tax Credit Carryforward [Line Items]
Operating Loss Carryforwards		$ 1,831.1
Research and development tax credit	[1]	504.6
Minimum Taxes		206.7	$ 206.7
Tax Year 2029
Tax Credit Carryforward [Line Items]
Operating Loss Carryforwards		0.0
Research and development tax credit	[1]	0.0
Minimum Taxes		1.1
Tax Year 2030
Tax Credit Carryforward [Line Items]
Operating Loss Carryforwards		0.0
Research and development tax credit	[1]	0.0
Minimum Taxes		107.8
Tax Year 2031
Tax Credit Carryforward [Line Items]
Operating Loss Carryforwards		0.0
Research and development tax credit	[1]	11.5
Minimum Taxes		71.7
Tax Year 2032
Tax Credit Carryforward [Line Items]
Operating Loss Carryforwards		27.4
Research and development tax credit	[1]	0.7
Minimum Taxes		22.2
Tax Year 2033
Tax Credit Carryforward [Line Items]
Operating Loss Carryforwards		80.5
Research and development tax credit	[1]	132.7
Minimum Taxes		0.2
Tax Year 2034
Tax Credit Carryforward [Line Items]
Operating Loss Carryforwards		85.5
Research and development tax credit	[1]	123.9
Minimum Taxes		0.1
Tax Year 2035
Tax Credit Carryforward [Line Items]
Operating Loss Carryforwards		81.0
Research and development tax credit	[1]	51.9
Minimum Taxes		3.6
Tax Year 2036
Tax Credit Carryforward [Line Items]
Operating Loss Carryforwards		249.0
Research and development tax credit	[1]	39.7
Minimum Taxes		0.0
Tax Year 2037
Tax Credit Carryforward [Line Items]
Operating Loss Carryforwards		492.5
Research and development tax credit	[1]	23.7
Minimum Taxes		0.0
Tax Year 2038
Tax Credit Carryforward [Line Items]
Operating Loss Carryforwards		199.3
Research and development tax credit	[1]	17.3
Minimum Taxes		0.0
Tax Year 2039 [Member]
Tax Credit Carryforward [Line Items]
Operating Loss Carryforwards		13.1
Research and development tax credit	[1]	14.6
Minimum Taxes		0.0
Tax Year 2040
Tax Credit Carryforward [Line Items]
Operating Loss Carryforwards		3.3
Research and development tax credit	[1]	12.9
Minimum Taxes		0.0
Tax Year 2041
Tax Credit Carryforward [Line Items]
Operating Loss Carryforwards		0.0
Research and development tax credit	[1]	8.3
Minimum Taxes		0.0
Tax Year 2042
Tax Credit Carryforward [Line Items]
Operating Loss Carryforwards		0.0
Research and development tax credit	[1]	10.5
Minimum Taxes		0.0
Tax Year 2043
Tax Credit Carryforward [Line Items]
Operating Loss Carryforwards		181.6
Research and development tax credit	[1]	13.6
Minimum Taxes		0.0
Tax Year 2044
Tax Credit Carryforward [Line Items]
Operating Loss Carryforwards		0.0
Research and development tax credit	[1]	12.8
Minimum Taxes		0.0
Tax Year 2045
Tax Credit Carryforward [Line Items]
Operating Loss Carryforwards		0.0
Research and development tax credit	[1]	9.6
Minimum Taxes		0.0
Tax Year, Indefinite
Tax Credit Carryforward [Line Items]
Operating Loss Carryforwards		417.9
Research and development tax credit	[1]	20.9
Minimum Taxes		$ 0.0

[1] Includes federal, provincial and state balances.